Look at the on the bottom of the box or the PCB inside:
Elias checked his version. He was running v3.0.0. beelink gt1 ultimate firmware
"The Superceleron build," he whispered, reading through a thread from 2020. "That's the one." Look at the on the bottom of the
Beelink abandoned firmware updates for the GT1 Ultimate years ago. The device runs Android 8.1 at best—an OS version that many modern apps no longer support. Custom firmware can extend its life for Kodi, IPTV, or light emulation, but for streaming or daily driving, the GT1 Ultimate is a legacy product. If you’re experiencing persistent issues and the correct firmware doesn’t solve them, it may be time to retire the unit. "That's the one
If your device is still functioning and you just want to check for minor official patches: